Drawing boards



J. E. KARMAZIN DRAWING BOARDS Nov. 3, 1970 8 Sheets-Sheetl Filed Feb. 20, 1968 irwsmm v A P r i 80 1 w w k w ....M w M at s JAN ERIC KARMAZIN ATTORNEYS v Nov. 3,1970 v J. E. KARMAZIN 3,537g6'73 DRAWING BOARDS Filed Feb; 20,-1968 8 shee-ts -sheet il i I a INVENTOR JAN ERIC KARMAZIN BY WWW ATTORNEYS J. E. KARMAZI N DRAWING BOARDS Nov. 3, 1970 B ShQet-Sheet 4.

Filed Feb. 2 1968 JAN ERIC KARMAZIN ATTORNEYS NOV, 35'19170 .L E. KARMAZIN 3,537,673 1 DRAWING BOARDS Filed Feb'l 20,1968 BShegts-Sheet 5 INVENTCR JAN ERIC KARMAZW ATTORNEYS i v Nov. 3,

Filed Feb. 20,,1968

J. E. KARMAZIN.

DRAWING BOARDS a Shets-Shet 6 sf- G} v 72 v7! 7 2 a 1 a": Q .X x f6 74 fig; z;

INVENTOR JAN ERIC KARMAZIN' I ATTORNEYS Nov. ,3, 1970 J. E. KARMAZIN 3,537,673

' I DRMIING IBOARDS Filed Feb. 20, 1968 a Sheets-Sheet 7 //2y2/ ,3 v &2

a/ a: emos JAN-ERIC KARMAZIN ATTORNEYS N ,1 970 J.E. IKARMAZIN- 7 DRAWING BOARDS Fiied Feb. 20, 1968 a Sheets-Sheet a INVENTOR JAN ERIC KARMAZIN BY W ATTORNEYS United States Patent US. Cl. 248-361 7 Claims ABSTRACT OF THE DISCLOSURE Drawing sheets are individually mounted on plates which have spaced recesses around their edges. Rulers having projections are mounted on a drawing board. A selected plate is easily mounted on the drawing board by the projections fitted into the desired recesses.

At the performance of drawings in conventional way the drawing paper is adjusted, stretched and attached, usually by means of adhesive tape, directly upon a drawing board coated by a sheet of suitable covering material. In the event that the drawing paper consists of a sheet having preprinted frame lines, the frame at least approximately must be adjusted to the scales of the drawing machine, but if an unfinished drawing must be removed from the drawing board in order to make room for another, more urgent drawing and should be put up again at a later occasion, a more accurate operation of the adjustable knob of the drawing machine is required in order to adjust the scales to run parallel with the already drawn lines. Such an adjustment is often disregarded, and this will still more complicate the work.

The rather troublesome procedure for the putting up and removal of the drawing papers is often repulsive to draftsmen and constructors, and this fact increases the production costs. Additionally, a drawing, which has been removed from the drawing board, always is exposed to the risk to be damaged, soiled and wrinkled during the handling and moving of the same from a place to another. In the event that a number of original drawings are simultaneously performed, they usually are collected on a common table or upon a rack in a plan filing cabinet. Also, in this case the drawings are exposed to the risk to be damaged, and moreover the surveyability will be faulty.

These disadvantages have been eliminated by the present invention, which relates to a supporting element for the drawing paper, by means of which the drawing paper simply and rapidly can be put on a drawing board of any kind and easily removed when it is desired to use the drawing board in conventional way. Thus, the supporting element enables the drawing office to easily adapt its work to all requirements in the production and to the more or less urgent character of the drawings to be performed.

The invention generally is characterized by a supporting element, to which the drawing paper is attached in conventional way, for instance by means of adhesive tape, and comprising a plane, comparatively thin plate of stiff material and having at least two recesses located on either side of a symmetry plane of the plate, and at least two projections on the front face of the drawing board and being of the same thickness as said plate, so as to enable the plate to be adjusted in relation to the drawing board into a position, in which said projections engage into said recesses, by means of which the plate will be locked to the drawing board.

In this way the drawing owing to its connection with the plate can be easily handled throughout its performance, since the drawing paper can be easily removed from the drawing board together with the plate and moved to another place, for instance for the purpose of coordination of the drawings, photographing (microfilm recording) or approval by superior official.

A system comprising plates according to the present invention makes it possible to continuously clean and smooth down the plates by another person than the draftsman, and the latter will therefore not have to interrupt the drawing work.

By means of simple stands one or more plates supporting original drawing can be arranged on a desk or worktable for control, which may be necessary at the simultaneous performance of a number of drawings belonging to the same project. It is also possible to vertically adjust the position of the drawing paper during the work, even on drawing boards of old construction, at which such an adjustment up to now has been impossible.

The invention by way of example is described in the following specification with reference to the accompanying drawings, in which:

FIG. 1 shows, in front view, the plate mounted on a drawing board (the stand, drawing machine and other parts of the board without direct association with the present invention being omitted),

FIG. 2 shows, at an enlarged scale, the drawing board in side elevation,

FIGS. 3 and 4 show recesses of different form,

FIG. 5 is a sectional view of a recess,

FIGS. 6 and 7 show, at an enlarged scale, one of the projections of the drawing board in front view and section on the line VIIVII oflFIG. 6, respectively,

FIG. 8 shows, in side elevation and at an enlarged scale, the drawing board according to a second embodiment,

FIGS. 6 and 7 show, at an enlarged scale, one of the respectively, a third embodiment of the drawing board the rulers and supporting plate being omitted,

FIG. 11 shows, in front View, a fourth embodiment of the drawing board,

FIGS. 12-14 show, at an enlarged scale and in front view and vertical section, respectively, particulars of the embodiment according to FIG. 11,

FIG. 15 shows, in front view, a fifth embodiment,

FIGS. 16-18 show, at an enlarged scale and in front view and vertical section, respectively, particulars of the embodiment according to FIG. 15,

FIG. 19 shows, in front view, a sixth embodiment,

FIGS. 20-23 show, at an enlarged scale in front view and horizontal section, respectively, particulars of the embodiment according to FIG. 19,

FIG. 24 shows, in front view, a seventh embodiment,

FIG. 25 shows, at an enlarged scale and in section, a particular of the embodiment according to FIG. 24, and

FIGS. 26 and 27 show, in front view and vertical section, respectively, an identification element.

In the drawings, 1 represents a drawing board of conventional construction provided with a drawing machine and being mounted on a stand. The drawing machine and the stand are not shown. According to FIGS. 1 and 2 the drawing board at the top edge is provided with a long, horizontal angle iron rail 2 and a short, horizontal angle iron rail 3 and at its bottom edge with a long, horizonal angle rail 4 and a short, horizontal angle iron 5. The upturned leg of the rail is provided with three spaced notches 6, and the downturned leg of the rail 4 is provided with three corresponding, spaced notches 7. Each of the upturned leg of the rail 3 and the downnturned leg of the rail 5 is provided with one single corresponding notch.

In the drawings, 10 and 11 represent two metal rulers, which on the back of their top end portion are provided with a shoulder 12, which has an inclined underneath side 13 and a somewhat smaller width than the length of the notches.

The top angle iron rails 2 and 3 are provided with plate springs attached to the rails by means of screws 14 (FIG. 2). The fore end 16 of each plate spring 15 is upturned and engages into the respective notch and is by means of the spring action pressed against the inclined surface 13 of the shoulder 12. At the lower end the rulers 10, 11 are provided with a shoulder, which is shaped like an upturned hook of somewhat smaller width than the notches. If the top shoulder 12 of a ruler 10, 11 is brought into engagement with a notch and the ruler is pushed downwards, so that the shoulder 12 presses upon the upturned end portion 16 of the spring 15, the hook 17 at the bottom end portion of the ruler can engage into the corresponding notch of the bottom angle iron rail and coupled to the same by means of the spring action. The hook 17 is provided with a projection 18, which facilitates the engagement of the hook into the concealed notch. Owing to the fact that the inclined surface 13 of the shoulder 12 is pressed against an inclined surface 16 of the plate spring 15, the ruler will be firmly pressed against the front surface of the drawing board. The rulers 10, 11 are also somewhat curved in the longitudinal direction with the convex surface facing the drawing board 1, so that they lie close to drawing board surface for the whole of their length. In order not to block the movements of the scales of the drawing machine, the edges 19 of the rulers 10, 11 are bevelled, and the rulers taper from the middle portion towards the top end, as shown in FIG. 1. The top end of each ruler 10, 11 is provided with a finger recess 10a, 11a in order to facilitate the mounting and dismounting of the ruler.

The right hand ruler 11, which is adapted to engage into one of the notches 6, 7 in the angle iron rails 2, 4, at the middle portion of its inner edge is provided with a semicircular, disk-shaped projection 20, which is integral with the ruler. The left hand ruler 10, which is adapted to continuously engage into the notches in the short angle iron rails 3, 5 directly opposite the projection 20 is provided with a similar, semicircular, disk-shaped projection 21, which however is mounted on a resilient arm 22 (FIG. 6) attached to the ruler 10 by means of two rivets 23. At the top end the arm 22 is provided with a lateral hook 24, which engages into an L-shaped recess 25 in the back surface of the ruler. The upturned end 26 of hook 24 acts as a stop in order to limit the lateral movement of the resilient arm 22. The edges 27 of the semicircular projections 20, 21 have a V-shaped cross section (FIG. 7).

The drawing paper is attached to a plane, relatively thin (approximately 3 mm.), square plate 28, preferably of white or light-colored, synthetic resin or aluminum. Each of the four edges of the plate 28 is provided with a number of semicircular recesses 29 arranged directly opposite each other. The edge 30 of each recess 29 is bevelled at both sides of the plate (FIG. 5) in order to engage with the V-shaped edges 27 of the projections 20, 21. Also the straight portions 28a of the plate edges between the recesses 29 are bevelled at both sides of the plate 28 in order to facilitate the catching of the plate by the fingers.

After both rulers 10, 11 have been attached to the drawing board 1 in the above described manner, the left band edge of the plate 28 is introduced between the rulers 10, 11 and moved towards the left hand ruler 10 until one of recesses 29 at the left hand edge of the plate engages into the V-shaped edge 27 of the spring-actuated projection 21 and moves the same to the left until also the right hand edge of the plate can be introduced between the rulers and by means of the directly opposite recess 29 at the right hand edge can engage with the projection 20 of the right hand ruler 11. Then the drawing paper is attached to the plate 28, for instance by means of adhesive tape. In the event that the drawing work must be interrupted before the drawing has been finished, the plate 28 is removed from the drawing board simply by moving the plate 28 to the left against the action of the resilient arm 22, so that the right hand recess 29 is released from the projection 20 of the right hand ruler 11 and the plate 28, which now can be removed from the drawing board together with the drawing paper.

In the event that drawing of another size should be performed, the ruler 11 is adjusted so as to engage into another pair of recesses 6, 7 in the angle iron rails 2, 4. The ruler 11 is released from the drawing board by downwards movement overcoming the action of the spring 15, so that the shoulder 17 is brought out of engagement with the recess in the angle iron rail 4, whereupon the ruler is moved upwwards so as to bring the shoulder 12 out of engagement with the recess in the angle iron rail 2. After the ruler 11 has been adjusted into a new position, another plate 28 of a size corresponding to the space between the rulers is attached between the projections 20, 21, as above described.

The shape of the projections 20 and the recesses 29 is optional, however the semicircular shape according to FIG. 3 or the angular shape according to FIG. 4 have turned out to be particularly adapted to the purpose. In the case of circular projections and recesses the projections should have somewhat greater radius than the recesses, so that there will arise only two points of contact or short contact lines between the edge of the projection and the recess, since this will obstruct any displacement of the plate in relation to the rulers and the drawing board.

Owing to that all of the edges of the plate 28 are provided with recesses, it will always be possible to put up the plate in any desired position. Thus, for instance, the drawing paper can be turned or in order to make it possible for the draftsman to have a comfortable position.

The locations of the recesses 29 also make it possible to mount the plate 28 at a desired height on the drawing board. Moreover, the symmetrical form of the plate 28 makes it possible to use both sides of the plate to the attachment of a drawing paper.

The material of the plates 28 is preferably a light, stiff but somewhat flexible, synthetic resin. The plates also can be made of an intermediate supporting layer of a hard synthetic resin, light metal or the like, which has a covering layer of a material, which is suitable as a basis for the drawing paper, for instance a softer synthetic resin, such as vinyl plastics.

In order to facilitate the identification of the drawings in a plan filing cabinet, a simple color code can be used, in that the corners 31 of the plates 28 are differently painted or marked with different patterns. At the putting up of the drawing paper on the drawing board plates supporting drawings belonging to the same project should be uniformly painted, for instance blue, at a predetermined corner, for instance its upper right hand corner, when they are in their proper place in the plan filing cabinet. By controlling the upper right hand corners of the plates in the cabinet it is very easy to distinguish drawings belonging to a certain project. This system will also be advantageous if it is desired to rapidly acquire informations about projects which are in preparation.

The plate 28 can be provided with auxiliary lines (not shown) in order to facilitate the drawing work.

FIG. 8 shows another embodiment of the attachment means of the rulers 10, 11. The top shoulder of each ruler 10, 11 consists of an U-shaped member 32, in which a bolt 33 is axially slidable and acted upon by a coil spring 34. The downwards movement of the bolt 33 by the spring action is limited by a stop collar 33a. At the lower end the bolt 33 is provided with a head 35, which has a bevelled underside and engages into the corresponding notch in the top angle iron rail on the drawing board 1. The bottom angle iron rails according to FIGS. 1 and 2 are replaced by flat iron rails 36, which are attached to the bottom edge of the drawing board 1. Analogous with the rails according to FIGS. 1 and 2, the rails 36 are provided with one and three notches, respectively, and the function is the same as at the construction according to FIGS. 1 and 2.

FIGS. 9 and 10 show another embodiment of the attachment means for rulers 10, 11 adapted to drawing boards having a drawing machine mounted on a carriage. A sleeve 37 by means of a nut 38 is secured in a bore in the drawing board 1. The one end 39 of the sleeve 37 consists of a conical head, which lies in a conical recess in the front surface of the drawing board 1. The ruler 10, 11 is provided with a rectangular shoulder 40, which acts as a guide member for the ruler in that it engages into a rectangular opening 41 in the end wall 42 of the sleeve 37. A plate spring 43, the one end of which is attached to the sleeve 37 by means of a screw 44, at its opposite end is bent downwards and rests on the upper, inclined surface 45 of the shoulder 40. A radial pin 46 in the sleeve 37 limits the movement of the spring 43 when the ruler 10, 11 is released from the drawing board 1.

The opposite end of the ruler 10, 11 is attached to a box 47 having a shaft, which by means of a nut 48 is secured in a bore in the drawing board 1. The rule 10, 11 is provided with a pawl-shaped shoulder 49, which by the action of the spring 43 engages with the edge of a rectangular opening 50 in the front wall 51 of the box.

The lower end 52 is bent at a right angle and acts as a grip for the mounting and dismounting of the ruler.

In this construction there are no parts mounted on the top and bottom edges of the drawing board 1, which can block the travelling of the drawing machine carriage or its guide system.

FIGS. 11-14 illustrate another embodiment of the attachment means for the plate, at which the projections are not mounted on rulers. The right hand projection comprises an oblong plate 53, the left end of which is semicircular and has a V-shaped edge profile. The opposite end 54 of the plate 53 is bevelled, so that it does not block the movement of the scales of the drawing machine. On the back the plate 53 is provided with a short shaft 55, which at its inner end supports a smaller, circular disk 56. The drawing board 1 is provided with a sleeve 57, which by means of a nut 58 is secured in a bore in the drawing board. In the end wall 59 of the sleeve 57 there is a keyhole-shaped aperture comprising a circular portion 60 of somewhat greater diameter'than the disk 56 and a slot 61 of somewhat greater width than the shaft 55. Between a ring 62 and an axially movable bottom 63 in the sleeve 57 there is a coil spring 64, which forces the bottom towards the disk 56. When the circular disk 56 is inserted into the circular portion 60 of the aperture, the bottom 63 is pressed inwards and-the spring 64 is compressed, after which the shaft 55 is moved into the slot 61, so that the plate 53 means of the action of the spring 64 will be rigidly coupled to the drawing board 1.

The left hand projection comprises an approximately semicircular plate 65 mounted on an U-shaped plate spring 66, which it attached to an Oblong plate 67 with a bevelled edge 68. At the top of the plate 67 is provided with a recess 69 for the upper, hook-shaped end 70 of the spring 66. On the back the plate is provided with attachment means of the same construction as above described with respect to the plate 53.

When it is desired to use the drawing board in conventional manner, the plates 53, 67 can be easily removed, after which a thin plate is put up on the drawing board.

A similar construction is illustrated in FIGS. -17. FIG. 15 shows a drawing board covered by a plate 72. The plate 67 with the projection 65 is attached to the plate 72 by means of riveting, glueing or molding. A plate 73, which is provided with keyhole-shaped apertures 60, 61 (FIG. ,16), is fit into the plate 72 and covers a recess 6 74 in the same. The plate 53 is attached to the drawing board 1 in the same way as previously described with respect to the construction according to Figures 11-14.

FIG. 18 shows means for the attachment of the plate 72 to the drawing board 1. In FIGS. 18, 75 represents a bolt, which by means of a nut 76 is secured in a bore in the drawing board 1. The bolt 75 is provided with a cylindrical head 77, which lies in an aperture in the plate 72, and a threaded end portion 78 carrying a nut 79, by means of which the plate 72 is secured to the drawing board.

FIG. 19 shows another system for the attachment of the plate to the drawing board, at which 80 designates a ruler, which is removably attached to the drawing board 1 in the above described manner. The ruler 80 is provided with a longitudinal channel 81, which is traversed by a rectilinear row of short, transversal pins 82. Each corner of the plate 83 is provided with hooks 84. At the attachmerit of the plate 83 one of the hooks 84 at the top edge is inserted into the channel 81, so that it engages with one of the pins 82, after which the corresponding hook at the bottom edge is also inserted into the channel so as to rest on the bottom of the channel. The hooks and pins must be arranged in such a manner, that the hook at the bottom edge always can be inserted between two adjacent pins 82.

According to this system the plate is attached to the drawing board by means of the force of gravity, and the system therefore can be used only at drawing boards with an inclined surface. For horizontal drawing boards the pins and hooks must be replaced by mechanical coupling elements.

A construction with a circular plate is illustrated in FIG. 24. The recesses of the plate 85 consist of two tracks with angular cross section profile running along the periphery on either side of an intermediate edge flange (FIG. 25), but other profiles are also possible. The plate 85 rests on at least two supporting shoulders 86 attached to the drawing board by means of screws 87 and provided with two spaced projections, which engage into the tracks in the plate.

This construction can be used only on inclined drawing boards, at which the gravity force keeps the plate 85 in its proper position. For horizontal drawing boards an auxiliary resilient projection is necessary in order to press the plate against the supports.

The system according to FIG. 24 is well adapted for draftsmen, lithographers and others requiring a turnable drawing board with stepless adjustment in any desired position. The plate 85 by means of printing or engraving can be divided into degrees.

The supporting means according to FIG. 24 also can be used in connection with square plates. In this case the suporting members consist of at least two arms, which are slidable perpendicularly to the plane of the drawing board in guideways at the bottom edge of the board. After the arms have been pulled out from the drawing board, the plate is placed upon them and pressed against the drawing board surface by means of upturned end portions of the arms.

FIGS. 26 and 27 illustrate another system for the marking of the plates. Each corner of the plate 28 is provided with a circular aperture. Eighty-nine (89) represents a disk of colored, resilient, synthetic resin of somewhat greater diameter than the aperture. The disk 89 is provided with an approximately T-shaped slot, which enables the disk to be compressed, so that it can be forced into the aperture, in which it will be safely retained by means of the resilient force.

What I claim as new and desired to secure by Letters Patent of the United States is:

1. A drawing board having a removable drawing surface comprising:

(a) a board portion;

(b) a thin plate portion adapted to lie on the surface of said board portion; and

(c) attachment means extending above the surface plate portion may be securely held between said of the board portion for removably attaching said projections. thin plate portion to said board portion, said attach- 4. The drawing board of claim 2 wherein each of said ment means comprising at least two distinct fasteners distinct fasteners comprises a first portion extending above each of which comprise a first portion extending r the board portion and a second portion which does not above the board portion and a second portion which extend above the board portion, at least one of said disdoes not extend above the board portion, at least one tinct fasteners being severable so as to allow the reof said fasteners being severably whereby its first moval of the first portion and its reinseition at a different portion may be removed and repositioned on the oint on the board portion so as to accommodate plate board portion to accommodate a thin plate of a difportions of different sizes. ferent size. 5. The drawing board of claim 3 wherein said pro- 2. A drawing board having a removable drawing surjections are adjustably movable in order to accommodate face comprising: plate portions of various sizes.

(a) a board portion; 6. The drawing board of claim 3 wherein each edge of (b) a thin plate portion adapted to lie on the surface the recess is beveled on either side of the plate and of said board portion; and wherein the edge of each projection has a V-shaped pro- (c) attachment means extending above the surface of file corresponding to the beveled edge of the recess.

the board portion for removably attaching said thin 7. The drawing board of claim 3 wherein the recesses plate portion to said board portion, said attachment are symmetrically disposed on said plate and wherein means comprising a plurality of distinct fasteners there are precisely two projections a first of which is and wherein said thin plate is provided with a stationary relative to the drawing board and the second plurality of mating recesses whereby said plate porof'which is movable in a plane parallel with the drawing tion is securely held in a selected position on said f f 'f comprising P PE {mans to malmam board portion when said fasteners engage said matsald prolectlon Contact Wlth 531d lhln P ing recesses.

3. A drawing board having a removable drawing References Clted surface comprising: UNITED STATES PATENTS (a) a board portion; 1,394,538 10/1921 Copeland 33-76 X (b) a thin plate portion adapted to lie on the surface 1,891,052 12/1932 Ott 108--93 of said board portion, said thin plate having at least 1,5 0 1 /19 D 269254 two recesses located along opposite edges of the 2,430,362 11/1947 Carcallen 312231 platqand 2,460,712 2/1949 Peterson 108--28 X (c) attachment means extending above the surface 3,095,833 7/1963 Peter 108 28 X of the board portion for removably attaching said 3 CHANCELLOR E HARRIS Primary Fxaminer thin plate portion to said board portion, said attachd ment means comprising at least two projections on CL the surface of the board portion of substantially the same thickness as the plate portion whereby said 3376; 10828; 248-451; 269309 22 3? UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTIQN Patent No. 3,537,673 Dated November 3, 1970 Inventor(s) JAN ERIC KARMAZIN It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

' Col. 1, line 17, "fitted" should be fitting (Spec. page l,' line 6) Col. 2, line 36, "Figures 6 and 7 show, at an enlarged scale of the" should be Figures 9 and 10 show, in front view and vertical section, (spec. page 4, line 3) Col. 2, line 65 "2" omitted between "rail" and "is" (spec. page 5, line 4) Col. 4, line 8 "a" omitted between "that" and "drawing" (spec. page 8, line 1) Col. 5, line 26, "rule" should be ruler (spec. page 11, line 1) Col. 5, line 61, "it" should be is (Spec. page 12,

' line 5) Col. 6, line 5, "Figures" should be Figure (spec. page 12, line 22) Col. 7, line 8 (Claim 1, subparagraph (c), "severably" should be severable Signed and sealed this 5th day of January 1971.

( AL) Attes't:

EDWARD M.FLETCHER,JR. WILLIAM SCHUYLBR, Attestlng Offi Commissioner of Patents 

